Comment: Share this with everyone you know! Did you know that posting a screenshot
of your cellphone on Facebook leave you open to be a victim of IDENTITY
THEFT? Every cell phone has a graphic signature embedded in the pixels
that can be easily deciphered by hackers with a simple computer program. A
screenshot like the one pictured can yield a person's location
information, phone number and unique SIM card ID number. It's this last
bit of information that can allow hackers to easily CLONE YOUR PHONE and
then monitor all your text messages, numbers and addresses in your contact
list, and even any credit or bank transactions you make from that phone.
If you know someone who is posting screenshots of their cell phone,
forward this to them and warn them to STOP NOW.

I have no idea if cell phone cameras actually do that. Most digital cameras do add certain meta-data to the image file. Date and time are common, location is possible if the device has GPS. You can easily see the meta-data though (in windows just right click on the image and "properties" then "details") and it can be easily edited or deleted.

Even if it were true that cellphones use pixel steganography, a screenshot will usually be a .PNG, Facebook converts to .JPG, so precise pixel values would be altered, and so the information would be lost.